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Physical conditions that lead to the detection of the pair annihilation line in the BOAT GRB221009A

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arxiv 2407.16241 v2 pith:IPOU43W2 submitted 2024-07-23 astro-ph.HE

Asaf Pe'er , Bing Zhang This is my paper · ORCID
classification astro-ph.HE
keywords lineemissionannihilationpairboatconditionsdetectionexplained
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abstract

The brightest of all time (BOAT) GRB221009A show evidence for a narrow, evolving MeV emission line. Here, we show that this line can be explained as due to pair annihilation in the prompt emission region, and that its temporal evolution is naturally explained as the high-latitude emission (emission from higher angles from the line of sight) after prompt emission is over. We consider both the high and low optical depth for pair production regimes, and find acceptable solutions, with the GRB Lorentz factor $\Gamma \approx 600$ and the emission radius $r \gtrsim 10^{16.5}$~cm. We discuss the conditions for the appearance of such a line, and show that a unique combination of high luminosity and Lorentz factor that is in a fairly narrow range are required for the line detection. This explains why such an annihilation line is rarely observed in GRBs.

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Cited by 2 Pith papers

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    astro-ph.HE 2025-04 conditional novelty 6.0 of 10

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  2. Gamma-ray bursts: what do we know today that we did not know 10 years ago?

    astro-ph.HE 2024-12 unverdicted

    A review of the past decade of gamma-ray burst research, highlighting structured jets, GR-MHD simulations, TeV detections, and the contested idea that many GRBs have moderate Lorentz factors.

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